Air-pump.



1. H. SPENCER.

AIR PUMP. APPLICATWN FILED Aue.27,1915.

Patented May23,1916.

WITNESSES:

following is a specification.

IRA H. SPENOER, OF WEST HARTFORD.

POWER COMPANY, OF HARTFORD, CONNECTICUT. A CORPORATION conuno'ncu'r. ASSIG-NOR To mm oaeiiiv OF CON- AIR-PUMP.

Specification of LettersjPatent.

Patented May 23, 1916.

Application filed August 27, 1915. Serial 'No. 47.712.

To all whom it may concern:

Be it known that I, In. H. brnxonn, a

citizen of the United States, and a resident of West Hartford, in the county of Hartford and State of Connecticut, have invented a new and Improved Air-Pump, of which the My invention relates more especially to that class of devices employed for creating flow of a current of air, and an object of my invention, among others, 15 to provide a device of this classthat shall be especially applicable for use in connection with musical instruments, as organs, by reason quietness in operation.

One form of device embodying my invention, and in the construction and use of which the objects herein set out, as well as of its others. may be. attained, is illustrated in the,

accompanying drawings, in which- Figure 1 is a view in centrallengthwis'e section through a pump embodying my invention. Fig. 2 is a detail view in cross section through the driving shaft showing parts supported thereon and one of the fans in face view.

In the operation of fans or pumps to place air in proper condition for use in musical instruments, it frequently happens that the vibration incident to the operation of such apparatus causes a. sound, often similar to a deep bass note, which is transmitted through the tubes for conveying the air or otherwise so that it is audible within the zone within which the notes of the instruments are heard, and it is to avoid this and other objectionable sounds. and to otherwise improve the construction that I have produced the device described herein and shown in the accompanying drawings, in which the numeral 5 denotes a case preferably formed of metal, circular in cross section, and having a compartment closed at its ends by plates 6-7. An exhaust opening 8 provides for the outflow of air from the case through an exhaust pipe 9 to which a. conduit is attached, and through which theair flows in connection with the musical instrument with which 1t'1s used, said air being supplied to a reservoir or otherwise as the circumstances may require. A shaft 10 is connected with or comprises an extension of the shaft of the motor 11, the end of the shaft opposite the motor, in the construction herein shown, being unsupported.

All of the parts herein above described are of old and well known construction and except in connection with other parts of the device to be hereinafter described form no part of the present invention.

1 have found that if the fans are loosely connected with the driving shaft that much of the objectionable noise will be prevented, V I

and in carrying out this idea I mount thehub of each fan loosely upon the shaft 10,

that is so that said hub, except for its driving connection, may be rotated independently of the shaft, suitable devices being employed for holding'the hub in its proper position lengthwise of the shaft. The hubs may be differently arranged with respect to the rest of the fan and to suit varying conditions. two examples being shown herein in which the hub 12 of-one fan is located on that side of the flange 14 that supports the fan blades 15 while the hub 13 of the other fan is located on the opposite side of said flange. Such number of blades will be secured to each flange as may be desired to complete the set.

A driver is rigidly secured to the shaft and projects between members spaced apart and rigidly secured to the flange, this driver being located in proximity to said spaced members so that by a slight movement in one direction it will press loosely against one of said members to drive the fan and when the speed of the shaft is decreased the fan traveling ahead will cause the other spaced member to rest loosely against the driver and the speed of the fan is thus retarded. This driver'may be constructed in various ways, in a satisfactory form of construction and as shown herein there being a driver hub 16 that is rigidly secured to the shaft and that has arms 1 718 projecting preferably from diametrically opposite sides thereof. Each of these arms is constructed so that it may be employed as adriving arm but in most instances one arm only will be employedvas a driving arm while the other will constitute a counterbalancearm. In the form of construction shown herein the outer ends of the arms 17 are offset from the opposite end of the arm and is secured to the hub while the arms 18 are straight. It is desired that the driving arm shall press against a fan blade at a point somewhat near the flange 14, and when the hub, as 12, is located on the 1 same side of the flange as are the fan blades 'ings.

driving cushion topropel the fan forward speetive of that side of the flange which the.

hub is located on.

Each of the arms is formed with a driving' head 19 at its outer end, each head being regessed upon opposite sides to receive a cushion 20, these cushionsbeing located 1n the arms thatare employed as drlvlngarms and the cushions resting loosely against a fan blade, as shown in the draw- One of these cuslnons'w1ll act as a and the other will act as a retarding cushion to prevent the fan from over-running,

that is, from rotating faster than the shaft when the speed of the latter is decreased.-

T he arm 17 or 18 on the opposite side of the hub from the arm that is employed as the driving arm will constitute a counterbalance arm to servev in balancing and steadying the movementof the driving arm in its rotation. Y

\Vhile I have shown and described herein a satisfactory means for loosely'connecting the driving shaft with the fan, it'is apparentto me that this loose driving con- IleCtlOIl maybe obtained in various ways and I do not, therefore, limit myinvention to the, exact means of effecting this connection herein shown and described.

1. A fan rotatably mountedfa member mounted to move independently of said fan and pressing loosely against it to'rotate it, and means for driving said member.

A fan rotatably mounted and includ ing a blade, :1 member to'move' independentlvof said fan and pressing loosely against said blade-to rotate the fan,.and means for drivingsaid member. y

3. A fan rotatably mounted and including a .number'of blades, a member movableindependently of said fan and extending'between said blades and pressing looselyigi. againsta blade to rotate it, and means for v blades secured to said flange, andIa-driving fmember. rigidly secured'to the-shaft and having armsyprojecting in-"op'posite-direc tions therefromfwith the outer;ends of the c arms arranged to press against'the 'fan blades in v the same place With the driving driving said member. 7

4. A fan rotatably mounted-and including a number of blades, a member movable independently of said fanand extending between two of said blades, and adapted to engage both of said blades to drive the fan or retard its movement, and means for driv ingsaid member.

A fan rotatably mounted, mounted to rotate independently of said fan, and means rigid with said shaft and loosely engaging said fan to rotate it.

In this ay it will be- .said spaced. members to loosely a shaft" 6. A shaft with means for'driving it, a fan loosely supported on the shaft, and, means rigid With the shaftand extending to press loosely against said fan to rotate it..

7. A shaft with means for driving it, a fan loosely supported on the shaft, and an arm rigidly connected with the shaft and projecting therefrom and pressing loosely against said fan to rotate it.

.8. A shaft with: means for driving it, a' fan loosely supported onthe shaft and consisting'of a plural'n-umber of blades, and an armY'rigi'dly connected With-the shaft and projecting between two 1 of "said blades Y proximity. thereto. to..press -loosely {against them'for driving and retarding operations." 7 I 9. A shaftjwithmean's,for. dr1vin'g it,-a

fan loosely supportedon the shaft and'hav-- in'g spaced members thereon, and means 1 rigid withthe shaftand projjectingbetween I engage them for drivingfland retarding purposes.-

10. '-A Share with" means for driving a fan loosely supported onltheshaft, said I fan-"havin'gspaced members rigidly sup ported thereby,=n1eans rigid with the. shaft and projecting loetvv eenv said spaced'members, and a cushioning 'member supported by said driving means to loosely" engage said spaced membersto rotate the-fan.

'11.: A shaft with means for driving it, a." 'fan loosely supported on the shaft anduhav'w, ing members rigidly secured thereto and spaced apart thereon. arms rigidly secured: to the shaft and projecting in opposite di rections therefrom, one of'said arm'seXtending between said spaced .members'to-"pre'ssi loosely against them for driving purposes v12. A shaft' with means .for d-rivingit, y

fans supported .on 'thep'shaffland having-I 1 means secured thereto and .aspacedfiapart.

thereon, arms rigidly securedzto theJshaft and-projecting in opposite directions there .v from, the outer end of one arm be'1ng"ofiset--' from its opposite end, andoneofsaid arms;;

I extending between said spaced member:to-v

pressagainst them for drivingpurpiosesi 13. A'shaft with means forfdriving it,a' hub'loosely supported on the shaft, a-flange projecting from one end of said r-hub, fan

member indifferent positions respect.

' IIJRA sP NoERet 

